diff --git a/src/browser/ReactDOM.js b/src/browser/ReactDOM.js
index 2749da4dbc9f5..789d9199f5d67 100644
--- a/src/browser/ReactDOM.js
+++ b/src/browser/ReactDOM.js
@@ -184,7 +184,9 @@ var ReactDOM = mapObject({
   g: false,
   line: false,
   linearGradient: false,
+  mask: false,
   path: false,
+  pattern: false,
   polygon: false,
   polyline: false,
   radialGradient: false,
@@ -192,9 +194,7 @@ var ReactDOM = mapObject({
   stop: false,
   svg: false,
   text: false,
-  tspan: false,
-  mask: false,
-  pattern: false
+  tspan: false
 }, createDOMComponentClass);
 
 var injection = {
diff --git a/vendor/fbtransform/transforms/xjs.js b/vendor/fbtransform/transforms/xjs.js
index acac965f87b9b..66a8fb13cb247 100644
--- a/vendor/fbtransform/transforms/xjs.js
+++ b/vendor/fbtransform/transforms/xjs.js
@@ -92,6 +92,7 @@ var knownTags = {
   map: true,
   mark: true,
   marquee: true,
+  mask: false,
   menu: true,
   menuitem: true,
   meta: true,
@@ -106,6 +107,7 @@ var knownTags = {
   p: true,
   param: true,
   path: true,
+  pattern: false,
   polygon: true,
   polyline: true,
   pre: true,